Detect HTTPS with JavaScript [duplicate]

javascript https

Looking at how google analytics add their script to the page:

ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';

Then document.location.protocol would seem safe for all browsers.

javascript https

You can use the non-standard

window.location.protocol

In IE, it seems to be

 document.location.protocol

I can't find reliable info on how this behaves on other browsers, but I expect they adhere to the quasi-standard of document.location.protocol.

Maybe the jQuery url plugin sorts this out without having to deal with cross-browser differences - I've never used it myself, but it looks promising:

jQuery.url.attr("protocol");

javascript https

location.protocol works on all browsers.

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